Phylicia Barnes, 16, was reported missing on Dec. 28. Investigators said she disappeared from the Reisterstown Square Apartments in the 6500 block of Eberle Drive, an area that is now awash in fliers with her picture.

Barnes had a scheduled flight to North Carolina on Monday morning which she did not take.

Police said Barnes, who is from Monroe, N.C., has no history of criminal activity or running away from family.

"Detectives are growing increasingly concerned with this disappearance and now suspect foul play, possibly abduction," police spokesman Anthony Guglielmi said in an e-mail. "Investigators have no leads."

Guglielmi said city police are seeking national assistance in the case.

"It is likely that she may have been taken outside the state of Maryland," Guglielmi said.

The Baltimore City Police Department's homicide section is investigating.

On Saturday, family and friends gathered to support each other and plea for the honor roll student's safe return.

"I know she's traumatized right now. She's scared out of her mind right now. She's a little innocent girl who does not do any harm to anyone," said the girl's mother, Janice Sallis.

When last seen, Barnes was wearing a navy pea coat with a hood, blue jeans, a turquoise shirt and white slippers.

The waiting and worrying is taking a toll on the family.

"My family is not sleeping. My family is not eating," said Barnes' father, Russell Barnes.

Anyone with information is asked to call the Baltimore City Police Department.

Daniel Norris took a three-hitter into the eighth inning in his Detroit debut, J.D. Martinez hit a three-run homer and the Tigers beat the Baltimore Orioles 6-1 on Sunday to earn a split of the four-game series.